<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator=">">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <!-- active激活项索引 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <!-- activeIndex - 0 字符串转为数字类型 -->
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef">
        <!-- 激活的name会绑定到v-model中 -->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          label-width="100px"
          label-position="top"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <!-- 基本信息 -->
          <!-- el-tab-pane 父节点只允许el-tabs -->
          <el-tab-pane label="基本信息" name="0">
            <!--            prop="goods_name" 校验规则 -->
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格(￥元)" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量(g)" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <br />
              <!-- options 数据源 -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <!-- 商品参数 -->
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item
              v-for="item in manyTableData"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <br />
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  v-for="(item2, i) in item.attr_vals"
                  :key="i"
                  :label="item2"
                  border
                  size="mini"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>

          <!-- 商品属性 -->
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              v-for="item in onlyTableData"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>

          <!-- 商品图片 -->
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到的后台API地址 -->
            <!-- list-type 预览组件的呈现方式 -->
            <!-- headers 设置上传的请求头部 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">
                只能上传jpg/png文件，且不超过1G
              </div>
            </el-upload>
          </el-tab-pane>

          <!-- 商品内容 -->
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button @click="add" class="btnAdd" type="primary"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from "lodash";

export default {
  data() {
    return {
      activeIndex: "0",
      // 添加商品的表单数据对象  // 级联选择框选中的数组
      addForm: {
        goods_name: "a",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 1,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: "",
        // 商品的参数
        attrs: [],
      },
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "请输入选择商品分类", trigger: "blur" },
        ],
      },
      // 商品分类列表
      catelist: [],
      cateProps: {
        expandTrigger: "hover",
        label: "cat_name",
        value: "cat_id",
        children: "children",
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 图片上传的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      // 图片上传组件的请求头对象
      headerObj: {
        // 可看main.js中 的 拦截器
        Authorization: window.sessionStorage.getItem("token"),
      },
      // 图片预览的路径
      previewPath: "",
      previewVisible: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类数据失败");

      this.catelist = res.data;
      console.log(this.catelist);
    },
    // 级联选择器选择项变化，会触发的函数
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    // 离开标签页前，判断当前标签页的必填项是否已经完成
    beforeTabLeave(activeName, oldACtiveName) {
      // oldACtiveName 即将离开的标签页名字
      if (oldACtiveName === "0" && this.addForm.goods_name === "") {
        this.$message.error("请先填写商品名称");
        return false;
      } else if (oldACtiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请选择商品分类");
        return false;
      }
    },
    // tab栏的切换点击
    async tabClicked() {
      // 证明访问的是动态参数面板
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$http.error("获取动态参数列表失败");
        }

        // 遍历将attr_vals字符串用空格作为分隔符 分割为数组
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        });
        this.manyTableData = res.data;
      }
      // 证明访问的是静态属性面板
      else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$http.error("获取静态属性失败");
        }
        this.onlyTableData = res.data;
      }
    },

    // 点击了图片就触发，处理图片的预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },

    // 处理移除图片的操作
    handleRemove(file) {
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      // 2.从pics数组中，找到这个图片的索引值
      const i = this.addForm.pics.findIndex((x) => x.pic === filePath);
      // 3.调用数组的 splice 方法，将图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1);
      console.log(this.addForm);
    },

    // 图片上传成功的回调函数
    handleSuccess(response) {
      // console.log(response);
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path };

      // 2.将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项!");
        }

        // 深拷贝 lodash  cloneDeep(obj)
        const form = _.cloneDeep(this.addForm);
        // 将数组转换为字符串
        form.goods_cat = form.goods_cat.join(",");

        console.log(this.manyTableData);
        // 处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" "),
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          };
          this.addForm.attrs.push(newInfo);
        });

        form.attrs = this.addForm.attrs;
        console.log(form);

        // 发起请求添加商品
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post("goods", form);
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败");
        }
        this.$message.success("添加商品成功");
        this.$router.push("/goods");
      });
    },
  },
  computed: {
    // 获取选中的三级分类的id
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
};
</script>

<style scoped>
.el-checkbox {
  margin: 0 0.8vw 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 2vh;
}
</style>